Slurry drier



July 5, 1938. A. G. cARLsoN SLURRY DRIER Filed July 15. 1936 2 Sheets-Sheet 1 NN N m July 5, 1938.

G. CARLSON SLURRY DRIER Filed July 15', 19:56

2 Sheets-Sheet 2 5' @r'kwz:

g an Jul 5, 193s v I 2,122,857

UNITED STATES PATENT rmor:

2,122,857 interstitial 22:1 :51??? 99,812 6 Claims. (Cl. 159-9) The invention relates to slurry driers and has drying a slurry of the raw ingredients used in particular reference to apparatus which will making cement and for illustrative purposes the make use of the waste heat gases discharged from, apparatus is disclosed in connection with a kiln a cement kiln for drying aslurry of the raw inl0.' The waste heat gases from the kiln are used gredients used in making the cement. v by the apparatus for drying the slurry. The '5 Inthe wet process of making cement, water is kiln is of the conventional type and is provided added to the raw ingredients as a more homoat. its feed end with a housingor enclosure H- geneous mixture is'possible with the ingredients which functions to collect the waste heat gases in the form of a slurry After thorough agitation and deliver a large proportion of the same to 10 n mixin f the Slurry' the same is gen a y ,the conduit I! having communication with the 10 passed through drying apparatus to remove most housing at the upper portion thereof. Also leadof the water and the dried slurry is then delivered ing from the enclosure H is a stack l3 through to the kiln. By drying the slurry it is possible which part of the gases are expelled to the atto keep the length of the kiln to a minimumas mosphere. The conduit 12 extends upwardly at 15 otherwise a longer kiln would be required to p'roa slight inclination to the vertical and connects 15 vide the necessary drying time for the wet at its upper end with a similar conduit i4 havl ing a downward inclination and which joins at An object of the invention, therefore, is to proits" lower end with the cylindrical casing 15. Said I vide improved apparatus for drying a slurry and casing provides a heating chamber for the slurry, 29 which will use the waste heat gases expelled from the waste heat gases after circulating through the nthe chamber being expelled by the outletv con- Other objects of the invention are to provide duit l6. 7 improved drying apparatus of relatively simple, Said cylindrical casing is suitably supported construction and which can be economically opand positioned concentrically with respect to a 5 erated; to prbvide a drier wherein the slurry will drum [1. Said drum extends through the casing first travel through a heated drum and then in and projects from each end thereof, the end poran opposite direction through a heating chamtions each carrying an annular ring it! by which her; and further, to provide improved means the drum is rotatably mounted as the rings coni'or disintegrating and propelling the slurry tact rollers 20 suitably supportedby the conthrough the heating chamber to thereby directly crete foundation 2i. Sealing rings 22 are 10- 30 subject the same to the drying action of the hot cated at each end of the casing to prevent thegases passing through the chamber. escape of thegases therefrom while permitting With these and various other objects in view; rotation of the drum with respect to the casing. v the invention may consist of certain novel iea- Suitably fastened to the right hand end of the tures of construction and operation, as will be drum is an annular gear 23 having meshing en- 5 more fully described and particularly pointed out easement with a worm gear 24 v n y motor in the specification, drawings and claims ap- '25 The motor ay b Of the Variable Speed pended hereto. a type and accordingly the drum may. be rotated In the drawings, which illustrate an emhodiat any sp d qui for the p p r y n of an merit of the device, and wherein like reference iShe lm'if- 4 characters are used to designate like parts; Each end of the d u W is CIOSed y 8 Figure 1 is a vertical longitudinal view taken h 6 avi a ntral p nin f r p tin substantially through the center of drying appassage of a tube 2? therethrough, said tube exparatus constructed in accordance with the intending axially 0f the revolving drum and being as vention; V fixed at each end to a support 28 resting on the Figure 2 is a, transverse sectional i w taken foundation 2i. Each member 26 is provided with along line 2 2 of Figure 1; a journal 3t containing packing so as to form an Figure 3 is an expanded view of a secti of air tight joint between the fixed tube and the rothe drum showing the arrangement of the chains tetable r m- One d o h tube i s d y forming the agitating and propelling means for plate 35 but the other end connects with a slurry 50 the slurry; and feed pipe 32 which delivers slurry to said tube. Figure 4 is a fragmentary sectional view taken The slurry is forced longitudinally of the tube along line 4-4 of Figure 1 showing the angular and is discharged through opening 33 into the positioning of the scrapers. drum i1. Beyond said opening'the tube is pro- 66 The apparatus of the invention is primarily for vided with a partition 34 which blocks the travel same into the drum. Scrapers 35 are suitably fixed to and depend from the tube 21. Said scrapers are disposed at an inclination, as shown in Figure 4, to cause travel of the slurry longitudinally of the revolving drum.

The opening 33 in the fixed tube 21 admits the slurry to the 'left end of the revolving drum and openings 36 in the drum deliver the slurry to the right end of the casing l5. The waste heat gases contact the exterior of the drum l1 and-thus heat up the cylinder walls of the drum, which in turn have a drying action on the slurry within. The vapor from the slurry, due to the drying of the same, passes out through the openings 36 along with the semi-dried slurry. Located within casing l5 and substantially filling the heating chamber are agitating means for disintegrating the slurry and subjecting the small particles into which the same is divided by said agitating means to the drying action of the waste heat gases circulating through the chamber. The agitating means contemplated by the invention comprises a plurality of chains 31 suitably supported by struts 38, extending radially from the revolving drum II. The arrangement of the chains and their manner of support is fnore clearly shown in Figures 2 and 3. In the illustrated embodiment the chains are shown as including five tiers and in each tier the chains extend in six directions from each strut, as will be clear from reference to Figure 3.- The struts have an inclination designed to propel the slurry toward the left hand end of the chamber wherein a plu- 'rality of scoops 40 are located for causing discharge of the material to the spout 4|. Connecting with theend of the spout is a feeder tube 42 having a screw conveyor 43 operating therein. The feeder tube projects within the end of the kiln and the dried slurry is fed at a uniform rate by the screw conveyor to the kiln.

In the operation of the apparatus above described the slurry is forced under pressure through pipe 32 into the fixed tube 21. From the tube the slurry is delivered to the revolving drum and is propelled longitudinally of the drum by reason of the rotation thereof with respect to the scrapers 35. During travel of the slurry through the drum the same is partially dried and in this condition the slurry is discharged from openings 36 to the heating chamber provided by easing [5.

The slurry within the casing is kept in constant agitation by the struts and chains which comprise moving elements having the additional function of disintegrating the slurry and directly subjecting minute particles thereof to the drying action of the waste heat gases circulating through theheating chamber. Constant movement of the chains keeps them clean and free of the slurry which would otherwise adhere thereto. The slurry upon reaching the scoops 40 has a substantial portion of the moisture removed therefrom and the dried slurry is fed to the kiln at the proper rate by the screw conveyor 43.

The invention is not to be limited to or by details of construction of the particular embodiment thereof illustrated by the drawings, as various other forms of the device-will of course be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

What is claimed is:

I. In a slurry drier, the combination with means supplying high temperature gases, a casing I of the slurry, causing complete discharge of the receiving gases therefrom, a rotatable drum conpropelling the slurry within the drum in a direction toward said discharge port, and other means fixed to and rotating with the drum for propelling the slurry through the casing.

2. In a slurry drier, the combination with means supplying high temperature gases, a

casing receiving gases therefrom, a rotatable drum concentrically arranged with respect to the casing, means within the drum for propelling the slurry deliveredto the drum at one end thereof, said drum having openings at the end opposite the delivery means through which the slurry is discharged into the casing, and means including a plurality of chains rotating with the drum for propelling the slurry through the casing.

3. In a slurry drier, the ,combination with means supplying high temperature gases, a casing receiving gases therefrom, a. rotatable drum concentrically arranged with respect to the casing, means within the drum for propelling the slurry delivered to the drum at one end thereof, said drum having openings at the end opposite the delivery means through which the slurry is discharged into the casing, and means fixed t0 and rotating with the drum for propelling the slurry through the casing, said means comprising struts extending radially from the drum and chains carried by-said struts.

4. In a slurry drier, the combination with means supplying high temperature gases, of a casing through which said gases are caused to circulate, a rotatable drum concentric with the casing and having a discharge port at one end, means within the drum for propelling slurry delivered thereto in a direction toward said discharge port, whereby the slurry is discharged from said drum and delivered to said casing, and means rotating within the casing for disintegrating the slurry and subjecting the same to the drying action of said high temperature gases, said means being rotated by said drum.

5.. In a slurry drier, the combination with means supplying high temperature gases, of a casing through which said gases are caused to circulate, a rotatable drum concentrically arranged with respect to the casing and having a discharge port at one end, means within the drum for propelling slurry delivered thereto in a direction toward said discharge port, whereby the slurry is discharged from the drum and delivered to said casing, and other means within the easing and rotated by said drum for disintegrating the slurry and subjecting the same to the drying action of the high temperature gases, said other means propelling the slurry within the casing in a direction opposite to the travel of the slurry within the drum.

6. In a. slurry drier, the combination with meanssupplying high temperature gases, a casing receiving gases therefrom, a rotatable drum concentrically arranged with respect to the casing, means delivering slurry to the drum, said drum having openings at its opposite end through which the slurry is discharged into the casing, means within the drum for propelling the slurry toward said discharge openings, and other means fixed to and rotating with the drum for propelling the 

